Last update : 12/1/2004

nanmax - max (ignoring Nan's)

### Calling Sequence

  `[m,index]=nanmax(x)`
  `[m,index]=nanmax(x,'r')`
  `[m,index]=nanmax(x,'c')`

### Parameters

- `x`real or complex vector or matrix

### Description

This function gives for a real or a numerical matrix `x` his largest element `m` (but ignoring the NANs).

For `x`, a numerical vector or matrix, `m=nanmax(x)` returns in scalar `m` the largest element of `x` (ignoring the NANs). The form `[m,index] =nanmax(x,orient)` gives in addition of the value of the largest element of `x` (ignoring the NANs) in scalar `m`, the index of this element in `x`, as a 2-vector.

`m=nanmax(x,'r')` gives in the 1xsize(x,2) matrix `m` the largest elements (ignoring the NANs) of each column of `x`. If the form `[m,index]=nanmax(x,'r')` is used, the elements of the 1xsize(x,2) matrix index are the indexes of the largest elements (ignoring the NANs) of each column of x in the corresponding column.

m=nanmax(x,'c') gives in the size(x,2)x1 matrix m the largest elements (ignoring the NANs) of each row of x. If the form [m,index]=nanmax(x,'c') is used, the elements of the size(x,2)x1 matrix index are the indexes of the largest elements (ignoring the NANs) of each row of x in the corresponding row.

In Labostat, NAN values stand for missing values in tables.

### Examples

    x=[0.2113249 %nan 0.6653811;0.7560439 0.3303271 0.6283918]
    m=nanmax(x)
    m=nanmax(x,'r')
    m=nanmax(x,'c')

### Author

Carlos Klimann

### Bibliography

Wonacott, T.H. & Wonacott, R.J.; Introductory Statistics, fifth edition, J.Wiley & Sons, 1990.